Mixed Valent, Distorted Cobalt Ludwigite (Co3BO5/Co3O2BO3) and Its Composite with Reduced Multiwalled Carbon Nanotubes (R-MWCNT) in Enhancing the Domain Edge-Sharing Oxygen as Superior Water Oxidation Electrocatalysts

Sumana Kundu, Bibhudatta Malik, Deepak K. Pattanayak, Vijayamohanan K. Pillai

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Herein, we report, a hybrid of mixed valent cobalt ludwigite (Co3BO5) and reduced-multiwalled carbon nanotubes (R-MWCNTs) as an outstanding oxygen evolution reaction (OER) electrocatalyst. Interestingly, the composite acts as a potential OER electrocatalyst, displaying a low overpotential of 270 mV @10 mA cm−2, which is lower than that for the state-of-the-art RuO2 catalyst. The remarkable OER performance of the cobalt-ludwigite is attributed to its basic distorted open crystal structure, which has a relatively high crystal volume, owing to a domain network consisting of edge-sharing octahedra. Moreover, X-ray photoelectron spectroscopy clarifies the hybrid of cobalt-ludwigite and R-MWCNTs, exhibiting a stable π-cation-like interaction between the Co3+ of Co3BO5 rather than Co2+ and neutral π- cloud of R-MWCNTs, which helps in enhancing the conductivity of the system. Thus, the overall performance of the composite stems from the basic crystal structure of the Co3BO5 and the existence of synergistic effects between the R-MWCNTs on Co3BO5 through π-cation-like interaction. Hence, the results of this study might be useful in developing more efficient other ludwigite–carbon OER electrocatalysts as affordable alternatives.

Original languageEnglish
Pages (from-to)1670-1676
Number of pages7
JournalChemElectroChem
Volume5
Issue number13
DOIs
StatePublished - 2 Jul 2018
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

  • carbon nanotubes
  • electrocatalysts
  • mixed valent cobalt ludwigite
  • water oxidation
  • π-cation-like interactions

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